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최봉철,정구회,임봉수 大田大學校 産業技術硏究所 2003 산업기술연구소 論文集 Vol.14 No.1
This study was performed to evauate for the noodles wastewater with high viscosity and low nutrient (Nitrogen, and Phosphorus). To add nutrient to grow activated sludge highly, about. 2 kg/day fertilizer that contains nitrogen was fed to the influent. Both the status of the aeration tank and the treatment performance were observed. Before feeding nutrient, the MLSS concentration in aeration tank was about 1,400 ㎎/L, and Spharotilous, Thiothrix. Prordon etc. were detected, while the BOD, COD and SS removal efficiency were so low as 78%, 77% and 56%, respectively. After feeding nutrient the MLSS concentration in aeration tank was increased to about 2,700 ㎎/L, and Epistylis. Monostyla, Voticella etc. were observed to be prolific. Meanwhile average 98% of BOD, 94% of COD, 71% of SS were removed, the microorganism can be activated to improve the noodles wastewater treatment performance. It is recommend to set up thickener and dewatering facilities to treat wasted activated sludge.
Induction of Ovulation by Hormone Treatment in Ussurian Bullhead Leiocassis ussuriensis
Lim Sang Gu,Kim Young Soo,Han Hyung Kyun,Kim Kwang Suk,Kim Dae Jung,Kang Eon Jong,Son Sang Gyu,Kim Eung Oh 한국발생생물학회 2012 발생과 생식 Vol.16 No.4
The effects of ovulation induction in ussurian bullhead, Leiocassis ussuriensis, were investigated by treating ussurian bullhead with hCG, LHRHa, GnRHa, ovaprim, and pimozide. hCG was injected to ussurian bullhead at 0.75% NaCl, 5,000, 10,000, 20,000, and 30,000 IU, respectively. The ovulation inducement rates were 100% in 20,000 and 30,000 IU. Fertilization rates were 82.7% and 79.8%. Hatching rates were 59.4% and 57.2%. Ovulation time was between 16-19 hr The concentrations of LHRHa injected were 0.75 NaCl, 50, 100, 200, 300, and . The ovulation inducement rates were 100% in 300 and . Fertilization and hatching rates were 84.9% and 68.4% at . The times to ovulation were between 23 hr and 34 hr. Ovaprim of 0.75% NaCl, 1.0, 1.5, 2.0, 2.5 and 3.0 ml/kg were injected to the abdominal cavity. The ovulation inducement rate was highest at 2.0 and 3.0 ml/kg to 92% and ovulation time was between 27-38 hr. LHRHa concentrations of 0.75% NaCl, 50, 100, 200, 300 and were injected with pimozide (). Ovulation inducement rate was 100% from 200 to 400 IU with pimozide. Ovulation time was 22-36 h. Fertilization and hatching rates were 88.9% and 70.4% in with pimozide.
Lim, Sang-Gu,Baeck, Jae Min,Kim, Chul Won,Kim, Young Soo The Korean Society of Developmental Biology 2014 발생과 생식 Vol.18 No.3
Rearing experiments were conducted using several regimes combined with different photoperiods and water temperatures to investigate the role of temperature and photoperiod as environmental cues regulating reproduction in red marbled rockfish, Sebastiscus tertius. The initial gonadosomatic index (GSI) was $1.62{\pm}0.32%$ and that in the $15^{\circ}C$ control was $7.01{\pm}0.46%$ at the end of the experiment. The highest GSI was $9.10{\pm}0.35%$ in the 12L:12D photoperiod-treated fish. The highest GSI at $19^{\circ}C$ was $15.03{\pm}0.86%$ in the 12L:12D photoperiod treatment. The initial hepatosomatic index (HSI) was $3.09{\pm}0.72%$ and that in the $15^{\circ}C$ control was $3.88{\pm}0.45%$. The highest HSI was $4.00{\pm}0.56%$ in the 15L:9D treated fish. The highest HSI at $19^{\circ}C$ was $4.05{\pm}0.63%$ in the 12L:12D treated fish.
Lim, Sang Gu,Han, Hyoung Kyun,Kang, Jung Ha,Park, Hye Jung,Oh, Ji Su,Lim, Ji Su,Goo, In Bon,Park, In-Seok The Korean Society of Developmental Biology 2013 발생과 생식 Vol.17 No.3
Morphometric changes in the Ussurian bullhead, Leiocassis ussuriensis, and the Korean bullhead, Pseudobagrus fulvidraco, were observed during the early period of growth. Yolk length, yolk height, and yolk volume in the two species decreased within 9 days post-hatching (DPH) (p<0.05). The body lengths and body heights of both species increased gradually to 150 and 130 DPH, respectively (p<0.05). The horizontal distance between the anteriormost extension of the head and the anterior insertion of the pectoral fin, the anteriormost extension of the head ${\times}$ the verticality position of the anterior insertion of the primary dorsal fin rays, and the anterior insertion of the primary dorsal fin ${\times}$ the anterior insertion of the pectoral fin were greater in the Korean bullhead than in the Ussurian bullhead (p<0.05). However, the relative sizes of the head region, pectoral fin, ventral fin, and anal fin were greater in the Ussurian bullhead than in the Korean bullhead (p<0.05), and relative body depth and the size of the outer-mandible barbel were greater in the Korean bullhead than in the Ussurian bullhead (p<0.05). The growth curves of the morphometric characteristics of both species were divided into three types.